SGER: Failure of Teton Dam: A New Theory

0234103，Balasingam Muhunthan，华盛顿州立大学“提顿大坝的失败：一个新的理论“这项研究的目的是验证一个新的理论关于提顿大坝的失败。位于爱达荷州的提顿大坝在1976年6月5日的第一次蓄水中失败。造成14人死亡，经济损失巨大。 它的失败是一个最广为人知的事件，涉及一个大型土坝在最近的时间。大坝是按照现代标准设计和建造的，因此它的失败引起了工程专家的极大关注。 然而，包括独立小组（IP）和内部审查小组（IRG）在内的专家的故障评估和预测未能达成共识。 建议的失效机制包括水力压裂、内部侵蚀、湿煤层理论和桥台岩石缺陷。 然而，没有一项调查能够令人满意地解释为什么大坝在水库到达El时决堤。5301.7英尺，仅在Sta.附近。右基台15+00。这项调查是基于基本的“基于状态的土壤力学”的初步工作。这表明，在EL.5300 ft的核心（1区）中存在一条较深的开放式横向垂直裂缝，最深的裂缝仅出现在右桥台和Sta附近。14+00到Sta.15+00。 当水库水位上升到厄尔尼诺现象。1976年6月5日凌晨，5300英尺处，水通过开放的横向垂直裂缝流入位于El基岩上的透水下游2区。5200英尺 水流慢慢地将裂缝侵蚀成一条大隧道，导致大坝在几个小时后发生重大决口。 本文的初步工作是基于临界状态土力学框架。 它假定土的压缩性、孔压响应、屈服、破裂和破裂等剪切特性，在q-p-e（剪应力-平均应力-孔隙比）空间或等价的LI-p（流动性指数-平均应力）空间中取决于“土的状态”。在该计划结束时将举行为期一天的研讨会，届时一个专家小组将与调查人员会面，审查研究结果，并根据过去对提顿失败的调查提出批评。 专家委员会将包括来自美国垦务局、美国陆军工程兵团和学术界的专业人士。 研讨会的记录，沿着对提顿大坝事故的详细分析和建议，将通过万维网传播。

0234103, Balasingam Muhunthan, Washington State University"Failure of the Teton Dam: A New Theory"The objective of this research is to verify a new theory regarding the failure of the Teton Dam. The Teton Dam, in Idaho, failed during its first filling on 5 June 1976. It resulted in 14 fatalities and a very large economic loss. Its failure was one of the most publicized events involving a large earth fill dam in recent times. The dam was designed and built using modern standards; therefore its failure received considerable attention from engineering experts. However the failure assessment and prognosis by experts, including the Independent Panel (IP) and the Interior Review Group (IRG), failed to arrive at a consensus. Failure mechanisms suggested, included hydraulic fracture, internal erosion, the wet-seam theory, and defects in the abutment rock. None of the investigations, however, was able to explain satisfactorily why the dam breached when the reservoir reached El. 5301.7 ft and only in the vicinity of Sta. 15+00 on the right abutment. This investigation is based on a preliminary work using fundamental "state based soil mechanics". It indicates that a deep open transverse vertical crack(s) existed in the core (Zone-1) to EL.5300 ft and the deepest crack(s) occurred only in the right abutment and in the vicinity of Sta. 14+00 to Sta.15+00. When the reservoir rose above El. 5300 ft in the early hours of 5 June 1976, water flowed through the open transverse vertical crack(s) into the pervious downstream Zone-2, which was seated on bedrock at El. 5200 ft. The water flow slowly eroded the crack into a large tunnel leading to the major breach of the dam hours later. This preliminary work is based on the critical state soil mechanics framework. It assumes that the mechanical behavior of soils, such as the compressibility, pore pressure response, shear behavior with respect to yield, rupture and fracture, is dependent on the "state of soil" in q-p-e (shear stress-mean stress-void ratio) space or equivalently the LI - p (Liquidity Index - mean stress) space. A one-day workshop will be held at the conclusion of the program, at which a panel of experts will meet with the investigators to examine the research results and provide a critique in light of past investigations of the Teton failure. The expert committee will include professionals from the US Bureau of Reclamation, the US Army Corps of Engineers, and academics. The proceedings of the workshop, along with a detailed analysis of the Teton Dam failure and recommendations, will be disseminated via the worldwide web.